Many cooks like to have a bottle of olive oil near the stove. Some even choose to refill and reuse their bottle. However, oil and water do not mix, so washing the residual oil out of the bottle requires a bit of attention. Since many oil bottles have a thin neck that prohibits using a bottle brush or other cleaning utensils, use a grease-cutting product to remove all the oily remains before filling your bottle with new oil.
Fill the bottle half full with warm tap water.
Add two drops of dishwashing detergent and 1 tbsp. vinegar.
Put your hand over the top of the bottle, or seal it with the lid.
Shake the bottle vigorously.
Empty the bottle and inspect it. If there is still an oily residue in the bottle, repeat the steps.
Rinse the bottle by holding it under a running tap. After the bottle is full, sudsy water will come out the top. Keep running the water into the bottle until no more suds appear.
Dump all the water out of the bottle.
Put the clean glass bottle in the oven, set at 250 degrees Fahrenheit for about 10 minutes to completely dry the inside of the bottle.